I was planning on getting the collection for the summer sale since I was interested in the games by watching let's plays. I only played the original 3 ninja gaiden games on nes but never the modern ninja gaiden games.

I don't remember which version I played when I was young, but there was no blue/purple blood in sigma 2. Is there an option to turn the gore back on or this master collection is basically a downgrade of what I played like 15 years ago?

Besides that the second game is the sigma version instead of XBOX 360 original game. Are there any problem, know bugs, frame rate issues, control problems? Or overall is a good/decent port?

There's a new mod on Nexus, that restores the original blood geysers from wounds and also the gore effects for some enemy types. Showcase: https://www.youtube.com/watch?v=NrG1_3Bfx50 Mod: https://www.nexusmods.com/ninjagaidenmastercollection/mods/236